Speedometer-magnet mounting



J1me .3 J. ZUBATY- I SPEEDOMETER MAGNET MOUNTING Filed June 8, 1928 II Ia member of a magnetic speedometer hav1ng Patented June 3, 1931 an TATESP TENT OFFICE JOSEPH ZUBATY, OF FLINT MICHIGAN, ASSIGNOR TO A C SPAR-KPLUG COMPANYpOF FLINT, MICHIGAN, A COMPANY OF MICHIGANSPEEDOMETER-MAGNET, MOUNTING Application filed June 8,

This invention relates to magnetic measuring instruments and. Whileuseful elsewhere, has been designed especially for use in connectionwith acombined speedometer 5 and odometer as used on motor vehicles.

An object of the invention is to provide means to secure the magnet inposition on its support. Other objects such as simplicity in the holdingmeans,reconomy and con venience in assembly will be appreciated from areading of the following descrip tion.

In the drawing accompanying this description:

Figure 1 is a side elevation of a frame the improvedmagnet holding meansincorporated therewitl Figure 2 is a top plan view partly in section.

Referring by referencecharacters to the drawing, numeral 13 representsthe frame of a combined speedometer and odometer. This frame is to beenclosed in a casing, the latter to be secured to the instrument boardof a motor vehicle, as usual. At 5 is shown a part of the conventionalflexible drive shaft which is to makedriving connection between adriving member, preferably one of the driven shafts of the vehicletransmission, and the rotor shaft of the instrument. This rotor shaftwill, as usual, be geared to the odometer wheels and also serves torotate the rotor element within a fixed magnet and a speed indicatingcup. The inventionis in no way concerned with the details of theodometer. It may be mentioned that clips 7 secure the shafts of theseason and trip sets of number wheels, and also the shafts of thestar'wheels associated therewith. At 17 is a shaft driven by the rotorshaft, an extreme lower end of which appears in Figure 1, and whichisrepresented by numeral 19. At 21' is a clip holding the rotor shaft inposition. 23 is a clip which holds shaft 17 in position; i v p Theinvention is, furthermore, not con 'cerned with the details of aspeedometer except for the provision for holding the magnet in position.There may be mentioned,

1928. Serial No. 283,995.

however, a top plate 27 secured byfastening means 25 to the frame. Thistop plate preferably is formed With an integral stop 31 to limit therotation of the speed cup 33 hole jewel for the speed cup spindle in aweP- known manner. The lower bearings for the speed cup spindle arenotillustratcd but may, in a well-known manner, he carried by the upperend of the rotor shaft. At 43 isa hair spring adjuster rotatablysupported on plate 27, preferably by the member tlcarried by the plate27.

The invention constituting the subject matter of this applicationrelates more particularly to the means for securing the horseshoe orU-shaped magnet in horizontal position on the frame 13. This frame isformed with angularly related vertical faces 51 and 53, as best shown inFigure 2 at the base of which is a flat horizontal face 55, as shown inFigure 1. Upon this horizontal face the magnet rests its Walls engagingthe faces 51 and 53 in'a manner which will be obvious upon inspection ofthe figures. A strap 9 of non-magnetic material is used to completelysurround the U-shaped magnet 12 and secure it to the frame 13. From theframe 13 project two grooved studs 14, one

for engagement with each end of the strap. The strap has suitableterminal openings to receive the studs 14.

The strap is formed with crimps as at 15. When the magnet is to beplaced on the frame, the strap may be hooked at one end over one 3 ofthe studs and then positioned to embrace the magnet, and the other endhooked over the other stud. Any looseness or slackness in the strapsurrounding the magnet may be taken up by pinching either or both of thecrimped parts 15 so as to properly draw up the magnet tightly intoposition with its end faces in firm engagement with the several faces ofthe frame which are to co-operate therewithin positioning the magnet.Such ago a magnet-mounting is extremely simple and cheap to manufacture.It is easy and quick in assemblyand very efiective in use.

If it be-desired to secure a temperature compensating means, such adevice may readily be clamped in position between the strap and themagnet.v

I claim:

1. In combination with a measuring in-' strument including a frame and afixed magnet, a strip terminally-secured to said frame lying vin theplane of and embracing said magnet, said frame having parts engagingsaid magnet, said straphavingcrimps to be I pinched to firmly secure.saidmagnet in enin its ends and intermediate 'crimped parts, said framehaving studs in position :to engage said Openings when said strapsembraces 'said magnet,xsaid crimped portions, adapted v to be pinched tosecure saidemagnet firmly in position on said frame. I 3. Means tosecure a U-shaped magnet on 1ts frame COIIlpI1SlI1gfi,sfi6X1bl6 strap ofnonmagneticrmaterial, said strap having end i openings to engagestuds=onsaid frame and having crlmped portions intermediate its endsadap-tedto be pinched to holdvsaid magv net firmly in position.

4. A magnetic measuring instrument-comprising a U-shapedumagnet, arotary: indicating'means between the poles of-said mag e net, a framehaving auportion engaged by a and supporting said magnet,-.sai d framehavingjgrooved studs adjacent Ythe p les of the:

magnet, a strap of non-magnetic material surrounding the magnetand'having op enings to receive said. studs-,said strap h'aving angularcrimpedportions whereby, whenthe I g j crimpedportions are pinchedtogether, the strap holds the magnet'firmly in position. In testimonywhereof I afiix my signature.

JOSEPH ZUBATY. I

